I've thought this since they started making the mouth and arm specific items. Not enough things have nose poses! I love giving my avatars noses so much that they look really odd to me without them now!
Whilst I agree that default noses would probably be poor quality, this does not and should not be the case. There is no hard and fast rule that everything from the gold shops or dress-up page has to be of poorer quality. It is something that has happened because we have allowed it to become so.
They should make more nose items for the people that want them. I would not use them myself though. I like the cuteness of the small dot on my anime-face of the avatar. I'm also so used to seeing avatars without noses that seeing a few right now with a nose is really weird looking. o_O
●●●●● I've always enjoyed the idea of facial features that are more easily accessible, and in a variety of tones and shapes. I used to wear the Sharaku Nose, an item I still enjoy. I've seen quite a few different noses that were part of an evolving item, or of an entire face, but to have an item that was exclusively noses would be wonderful.
I have yet to find a nose on here that didn't look like a huge overripe pimple or wasn't hideous. I like noses in theory, but nothing has been made yet that has interested me. That said, it is something they should offer. I'd prefer it to be in ST or even Loyal's but they'll be a CS thing. Though having some offered in ST and some for cash might be a good compromise that Gaia might do.